PatchSiren cyber security CVE debrief

CVE-2024-44954 Siemens CVE debrief

CVE-2024-44954 describes a race condition vulnerability in the ALSA line6 driver involving racy access to the midibuf buffer. The vulnerability was addressed by implementing a spinlock to prevent concurrent access issues. This CVE was published on 2025-08-12 and last modified on 2026-02-25. The vulnerability is associated with Siemens industrial networking products, specifically the RUGGEDCOM RST2428P and SCALANCE X-family switches running SINEC OS. However, the CISA advisory marks the impact as 'Misinformed' for the affected product IDs, indicating potential clarification issues regarding actual affected status. The advisory underwent multiple revisions, with the most recent update on 2026-02-25 reflecting republication based on Siemens ProductCERT SSA-355557 advisory. No CVSS score or severity rating is available in the source data. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Vendor: Siemens
Product: RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS: Unknown
CISA KEV: Not listed in stored evidence
Original CVE published: 2025-08-12
Original CVE updated: 2026-02-25
Advisory published: 2025-08-12
Advisory updated: 2026-02-25

Who should care

Organizations operating Siemens RUGGEDCOM RST2428P or SCALANCE X-family industrial switches; OT security teams managing SINEC OS deployments; asset owners relying on CISA ICS advisories for vulnerability management

Technical summary

The vulnerability exists in the ALSA line6 driver's midibuf handling, where concurrent access could occur without proper synchronization. The fix implements a spinlock to serialize access to the midibuf structure. This is a classic race condition vulnerability (CWE-362) in kernel driver code. The advisory's 'Misinformed' impact classification suggests the original CVE association with Siemens products may require verification against the authoritative Siemens ProductCERT advisory.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT SSA-355557 advisory for authoritative affected product determination
Verify actual affected status of RUGGEDCOM RST2428P and SCALANCE X-family devices in your environment
Apply vendor-provided patches or updates for SINEC OS when confirmed applicable
Monitor CISA ICS advisories for updates to ICSA-25-226-07
Implement defense-in-depth strategies for industrial control systems per CISA recommended practices

Evidence notes

Source indicates 'Misinformed' impact status for listed product IDs (CSAFPID-0006, CSAFPID-0002, CSAFPID-0003). Advisory revision history shows multiple updates, with revision 4 on 2026-02-25 reflecting republication based on Siemens ProductCERT SSA-355557. The vulnerability description references ALSA line6 driver midibuf race condition fixed by spinlock implementation.

Official resources

2025-08-12